package com.clouddot.baipai.infrastructure.environment;

import android.annotation.SuppressLint;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Looper;
import android.widget.Toast;

import com.clouddot.baipai.ui.util.Log.LogUtil;
import com.clouddot.baipai.ui.activity.A_LaunchActivity;


import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Map;

public class CrashHandler implements UncaughtExceptionHandler
{
	private UncaughtExceptionHandler mDefaultHandler; // 系统默认的UncaughtException处理类

	private static CrashHandler instance; // CrashHandler实例

	private Context mContext; // 程序的Context对象

	public static final String TAG = "CrashHandler";

	private Map<String, String> infos = new HashMap<String, String>(); // 用来存储设备信息和异常信息

	// 用于格式化日期,作为日志文件名的一部分
	private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd:HH-mm-ss");

	/** 保证只有一个CrashHandler实例 */
	private CrashHandler()
	{
	}

	/** 获取CrashHandler实例 ,单例模式 */
	public synchronized static CrashHandler getInstance()
	{
		if (instance == null)
		{
			instance = new CrashHandler();
		}
		return instance;
	}

	/**
	 * 初始化
	 */
	public void init(Context context)
	{
		mContext = context;

		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler(); // 获取系统默认的UncaughtException处理器

		Thread.setDefaultUncaughtExceptionHandler(this); // 设置该CrashHandler为程序的默认处理器
	}

	/**
	 * 当UncaughtException发生时会转入该函数来处理
	 */
	@Override
	public void uncaughtException(Thread thread, Throwable ex)
	{
		if (!handleException(ex) && mDefaultHandler != null)
		{
			// 如果用户没有处理则让系统默认的异常处理器来处理
			mDefaultHandler.uncaughtException(thread, ex);
		} else
		{
			try
			{
				Thread.sleep(500);
			} catch (InterruptedException e)
			{
				Env.error(Environment.getInstance().fileUtil.Errorinfo(e));

				android.util.Log.e(TAG, "error : ", e);
			}

			Intent intent = new Intent(mContext.getApplicationContext(), A_LaunchActivity.class);

			// PendingIntent延时执行Intent
			@SuppressLint("WrongConstant")
			PendingIntent restartIntent = PendingIntent.getActivity(mContext.getApplicationContext(), 0, intent,
					Intent.FLAG_ACTIVITY_NEW_TASK);
			AlarmManager mgr = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
			mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 200, restartIntent); // 注册延迟定时器,200毫秒后重启应用
			System.exit(1); // (1)非正常退出
		}
	}

	/**
	 * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
	 * 
	 * @param ex
	 * @return true:如果处理了该异常信息;否则返回false.
	 */
	private boolean handleException(Throwable ex)
	{
		if (ex == null)
		{
			return false;
		}
		// 使用Toast来显示异常信息
		new Thread()
		{
			@Override
			public void run()
			{
				Looper.prepare();
				Toast.makeText(mContext, "程序出现异常,即将退出和重启.", Toast.LENGTH_LONG).show();
				Looper.loop();
			}
		}.start();
		// 收集设备参数信息
		collectDeviceInfo(mContext);
		// 保存日志文件
	    saveCrashInfo2File(ex);
		Env.error(Environment.getInstance().fileUtil.Errorinfo(ex));


		return true;
	}

	/**
	 * 收集设备参数信息
	 * 
	 * @param ctx
	 */
	public void collectDeviceInfo(Context ctx)
	{
		try
		{
			PackageManager pm = ctx.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
			if (pi != null)
			{
				String versionName = pi.versionName == null ? "null" : pi.versionName;
				String versionCode = pi.versionCode + "";
				infos.put("versionName", versionName);
				infos.put("versionCode", versionCode);
			}
		} catch (NameNotFoundException e)
		{
			Env.error(Environment.getInstance().fileUtil.Errorinfo(e));

			android.util.Log.e(TAG, "an error occured when collect package info", e);
		}
		Field[] fields = Build.class.getDeclaredFields();
		for (Field field : fields)
		{
			try
			{
				field.setAccessible(true);
				infos.put(field.getName(), field.get(null).toString());
				android.util.Log.d(TAG, field.getName() + " : " + field.get(null));
			} catch (Exception e)
			{
				Env.error(Environment.getInstance().fileUtil.Errorinfo(e));

				android.util.Log.e(TAG, "an error occured when collect crash info", e);
			}
		}
	}

	/**
	 * 保存错误信息到文件中
	 * 
	 * @param ex
	 * @return 返回文件名称,便于将文件传送到服务器
	 */
	private void saveCrashInfo2File(Throwable ex)
	{
		StringBuffer sb = new StringBuffer();
		for (Map.Entry<String, String> entry : infos.entrySet())
		{
			String key = entry.getKey();
			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");
		}

		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null)
		{
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		String result = writer.toString();
		sb.append(result);
		LogUtil.e(sb.toString());
//		try
//		{
//			long timestamp = System.currentTimeMillis();
//			String time = formatter.format(new Date());
//			String fileName = "crash-" + time + "-" + timestamp + ".LogUtil";
//			if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
//			{
//				String path = "/sdcard/crash/";
//				File dir = new File(path);
//				if (!dir.exists())
//				{
//					dir.mkdirs();
//				}
//				FileOutputStream fos = new FileOutputStream(path + fileName);
//				fos.write(sb.toString().getBytes());
//				fos.close();
//			}
//			return fileName;
//		} catch (Exception e)
//		{
//			LogUtil.e(TAG, "an error occured while writing fileUtil...", e);
//		}
//		return null;
	}

}
